<!DOCTYPE html>
<html>
<head>
<meta http-equiv="Content-Type" content="text/html; charset=UTF-8">
<title>浏览器网页内容的百分比缩放（按ctrl - | ctrl + | ctrl +滚轮键的缩放）</title>
<meta name="viewport" content="width=device-width, initial-scale=1.0">
</head>
<body>
<div>我是内容我是内容我是内容我是内容我是内容，，，禁止页面内容滚动（ 禁用 ctrl - | ctrl + | ctrl +滚轮 事件 ）</div>
</body>
</html>
<script type="text/javascript" src="jquery-3.4.1.min.js"></script>
<script type="text/javascript">
// //方法一
// 判断pc浏览器是否缩放，若返回100则为默认无缩放，如果大于100则是放大，否则缩小
function detectZoom (){
var ratio = 0,
screen = window.screen,
ua = navigator.userAgent.toLowerCase();
if (window.devicePixelRatio !== undefined) {
ratio = window.devicePixelRatio;
}
else if (~ua.indexOf(‘msie‘)) {
if (screen.deviceXDPI && screen.logicalXDPI) {
ratio = screen.deviceXDPI / screen.logicalXDPI;
}
}
else if (window.outerWidth !== undefined && window.innerWidth !== undefined) {
ratio = window.outerWidth / window.innerWidth;
}
if (ratio){
ratio = Math.round(ratio * 100);
}
console.log(window.devicePixelRatio, 123)
return ratio;
};
// window.onresize 事件可用于检测页面是否触发了放大或缩小。
window.addEventListener(‘resize‘, function() {
isScale();
})
isScale();
//判断PC端浏览器缩放比例不是100%时的情况
function isScale(){
var rate = detectZoom(),
isMac = /macintosh|mac os x/i.test(navigator.userAgent); // Mac默认缩放值为200，windows默认为100，需要分开判断
if((isMac && rate !== 200) || (!isMac && rate !== 100)){
//如何让页面的缩放比例自动为100,‘transform‘:‘scale(1,1)‘没有用，又无法自动条用键盘事件，目前只能提示让用户如果想使用100%的比例手动去触发按ctrl+0
// alert(‘当前页面不是100%显示，请按键盘ctrl/command + 0恢复100%显示标准，以防页面显示错乱！‘)
}
}
// 阻止pc端浏览器缩放js代码
// 由于浏览器菜单栏属于系统软件权限，没发控制，我们着手解决ctrl/cammond + +/- 或 Windows下ctrl + 滚轮 缩放页面的情况，只能通过js来控制了
document.addEventListener(‘DOMContentLoaded‘, function (event) {
// chrome 浏览器直接加上下面这个样式就行了，但是ff不识别
document.body.style.zoom = ‘reset‘;
document.addEventListener(‘keydown‘, function (event) {
if ((event.ctrlKey === true || event.metaKey === true)
&& (event.which === 61 || event.which === 107
|| event.which === 173 || event.which === 109
|| event.which === 187 || event.which === 189))
{
event.preventDefault();
}
}, false);
var scrollFunc = function (event) {
event = event || window.event;
if (event.wheelDelta) { //判断浏览器IE，谷歌滑轮事件
if (event.ctrlKey === true || event.metaKey) {
event.preventDefault();
}
}
};
//给页面绑定滑轮滚动事件
if (document.addEventListener) {
document.addEventListener(‘DOMMouseScroll‘, scrollFunc, false);
}
//滚动滑轮触发scrollFunc方法
window.onmousewheel = document.onmousewheel = scrollFunc;
}, false);
//方法二
document.addEventListener(‘keydown‘, function (event) {
if ((event.ctrlKey === true || event.metaKey === true)
&& (event.which === 61 || event.which === 107
|| event.which === 173 || event.which === 109
|| event.which === 187 || event.which === 189)) {
event.preventDefault();
}
}, false);
// Chrome IE 360
window.addEventListener(‘mousewheel‘, function (event) {
if (event.ctrlKey === true || event.metaKey) {
event.preventDefault();
}
}, { passive: false });
//firefox
window.addEventListener(‘DOMMouseScroll‘, function (event) {
if (event.ctrlKey === true || event.metaKey) {
event.preventDefault();
}
}, { passive: false });
</script>
